Why do I need a CRT-D?

Your doctor would suggest a CRT-D because he or she believes you're at risk for Sudden Cardiac Arrest (SCA) and has concerns about the pumping action of your heart. The most effective way to treat SCA is with defibrillation, provided either externally, say, in a hospital or ambulance, or by an implanted device. A CRT-D not only handles that, it continuously monitors your heart's rhythm and helps keep both sides in synch.